Valve grinder



IF. l. M'RIFIIEIJL.l VALVE GRINDER. APPLxcAUhN FILED JAN. I8. 1922.

Mmm om 1m, w22.,

2 SHEETS-SHEET I.

F. j. ERFIEL VALVE Gamm. APPLICATIONr FILED JANE81922. fzf TL Patented 00%. JMLJWZ..

2 SHEETS-SHEET 2.

ruimte ou., iu, maa.

verve earunnn.

Application filed January 18, `1922. Serial No. 530,221.

To all/whom t may conce/m: f

i Be it known that l, FERNANDO JOHN Diani i FIELD, a citizen of the United States, and a resident` of Boise, inthe .county `of Ada `and State of ldaho, have invented certain new and useful Improvements .in` Valve Grinders, of which the following is a specification. i j

`This invention relates to improvements in valv'egrinders, and isiespecially adapted for use in grinding valves of the overhead type which embody a valve and cage,s uch as fare used upon the Buick automobiles. 'lhe object ofthe invention is to provide a valve grinder of this character in-which the valve and its seat are subjected to such grinding `action as will insurea uniform and complete grinding of the entire working i surfaces ofthe valve and seatwhereby perfeet seating of the valve is brought about andwhereinall of the phases of the valve grinding `operation `are automatically carried out. i j j i `Another object is to provide `a valve grinder of this character which is of simple and durable construction, reliable in operation and easy and inexpensive to manufacture and operate and which is adaptedto meet varying requirements of this character of work. V j

Other objects and advantages of the ini vention reside incertain novel features of construction, combination and arrangement of parts which. will be hereinafter more fully ldescribed and particularly pointed out in the appended claims, `reference being had tothe accompanying drawings forming part of the specification and in which:

Figure l is a plan view ofthe preferred embodiment of the invention;

4Figure 2is a fragmentary lview in side elevation; i j i i Figure 3 is a `detail perspective view of the rocking lever; j j j j j Figure e is a similar view of one ofY the lift rods toe;

Figure yis a similar `view of the rotating camdisk; j l

Figure 6 is a similar view ,of the lifting Figure -7 is a similar view of the `lifting forkgand j i Figure 8 a `similar view of one of the crank arms.

Referring to the `drawings wherein for the sake of illustration is shown the preferred embodiment of the invention, it will be seen that the valve grinderis of that type forming the subject-matter of my prior Patent No. 1,325,835. ln the improved construction which constitutes the present invention, there is provided a pair of standards, designated at `l0 and ll, which up-` stand from bases l2 and 13,4the standards being preferably threadedly connected with the bases. A frame l5 is mountedvfor slidm ing adjustment on the standards l0 and 11 and may be held in adjusted position thereon by means of set screws or the like which `are preferably carried by the frame and engageable with the standards. i A plurality of vertical spindles, designated at 20 and 2,1 are rotatably journaled in bearings 22 and 23 provided therefor on the frame l1 and carry at their lower ends chucks, designated at 24 and 25 which `may be of any suitable type but which preferably are of the three jaw type of chuck. "The chucks are adapted to engage a stem S of the valvesV so that the kmotion` of` the spindles is imparted to the valves and the valves on the other hand carry the cages C whichas usual are tapered or reduced, as at c at their lower ends. These valves are the overhead type of valves suchas used on Buick motors.y

Means is provided for imparting an oscillatory movement to the spindles 22 and 23 and preferably includes acrank arm 26 hav-l ing a bearing portion`2tia at one end which embraces and is fixed to the spindle 20. The outer end of the arm 26 is slotted as at`26b and is pivotallyconnected with one end of a link 27 theopposite end of the link 27 being connected with a slotted end 28a of th'e rocking lever or arin28`which isprovided intermediate its ends with a bearing portion or hub 28b by means 'of which itis secured or fixed to the upper end of the spindle 2l.4 As shown in Figures l and 2 nuts designated at 29 and 30V are threaded on the upper ends of the spindles 20 and 2l and engage the upper surfaces of the bearing portions of the crank arm "and crank, respectively. It is to be understood that suitable means employed forkeying or fixing the bearing portion of the crank arm 26 and rocking arm 28 to the spindles` 20 and 2l, respectively. The end of the rock arm 28 opposite the connection with the link 27 is slotted as at 28 and this slotted end 28C is suitably connected to one end of a connecting rod 31, the opposite end of which is pivotally connected to a crank pin 32 carried by a driving pulley 33. The driving pulley`33 is actuated by belt gearing 34 from any suitable source of power and by means of the crank pin 32 and connecting rod 31 imparts rocking movement tothe rocking arm 28,. This rocking movement of the arm 28oscillates the spindle 21 and through the link 27 and crank arm 26 also oscillates the spindle 20. In thisy manner oscillatory movement is imparted to ythe valves V andsuch movement Ioit the valve V will also result in movement :of the valve cages C. lVith the construction so tar described however uniform, complete and smooth grinding of the valves will not always result as the valve V will tend to turn the cages C in one direction aswell as in the other direction. In the present improved construction, it is proposed to provide means `of a novel character and highly organized `with the mechanism above described for insuring relative rotation ot the valve V and cagesC while not impairing to any degree the grinding action between the cages and the valves. For this' purpose a plurality of llift rods designated at 40 and 41 is provided. l@ne such lift rod is provided for each 'spindle and the lift rod of each spindle is disposed .adjacent thereto. The upper ends koit the 'litt rods 40 and 41 are bifurcated so as to vprovide long arms 42 and 44 and short arms 43 and 45, each litt rod having one longarm and one short arm as clearly shown in Figure 2. The arms ol' the bifurcated ends of 'the lift rods are journaled vfor reciprocatory lmovement in the trame downward movements of the lift rods are cushioned by means of coil springs 46 and 47 mounted on the arms 42 and 44 ot the lift rods 40 and 41, respectively and engageable with the trame at their lower end and with eotter pins 48 and 49 respectively at their upper ends. Adjacent the lower ends of the lift rods 40 and 41 lifting lorks 50 and 51 are adjustably secured by means of set screws 52 and 53, respectively. The arms of 'the lifting forks embrace the reduced porJ tion c of the cages C and while the cages C are freely rotatable with respect tothe forks 50 and 51 upward movement of the forks is imparted to the cages since the cages present a shoulder between the main portion thereof and the reduced portion c and since this o shoulder is engageable with the arms of the forks. l

Means is provided for periodically, that is at predetermined and regular intervals, imparting lifting movement to the lifting rods 40 yand 41 andpreferably includes a rotating cam disk 60 mounted for rotary movement on the frame 15 and having a cam lug 61 secured to the upper face thereof and periodically and successively engageable with lifting toes 62 and 63 adjustably secured by means of nuts 64 and (35 to the upper ends of the long arms 42 and 44, respectively of lifting rods 40 and 41.

Speed reduction gearing is provided for driving the rotatable cam disk 60 from the driving pulley 33 and this speed reduction gearing preferably includes a small pulley 6G fixed to the axis or shaft of the driving pulley 33 and drivingr a large pulley (37 by means of a belt 68 the large pulley 67 being rotatably mounted upon an arm 69 extending laterally from the frame and this large pulley 67 having xed thereto a small pulley 70 which in turn drives the rotating cam disk v60, the cam disk 6() being larger than the small pulley 70 and being driven 'from this small pulley by means of a belt 7 l. which is trained over the small pulley 70 and which operates in the peripheral groove G0 provided in the rotating cam disk 60. The ratio between the pulleys of the reduction gearing may be varied as desired to secure the proper lift of the valve cages at the proper intervals and in the form shown it heilig adapted to meet certain requirements, the ratio is approximately 7 to 1.

ln the operation of the valve grinder the cam disk 60 has a continuous rotary motion, it being driven from the driving pulley 33 by the speed reduction gearing above described. At one time during the revolution oi the disk (SO its camming lug (51 engages the lift toe (32 and raises the lii't rod 40 whereby the valve cage C engaged by the lork 5t) is also raised thus permitting 'the valve V to partake of its oscillating Inovement or a portion of its oscillating nievement dependent upon the ratio between the rate of oscillation of the spindle and rate ot rotation o'lI the cam disk GO. As soon as the camming lug 61 disengages the lifting toe 62 the weight of the litt rod 4() and associated parts returns the lil't rod to its lowermost position so that the cage (l again engages the valve V. This gravity return et the litt rod does not however subject the cage and valve or the machine to any shocks as the buffer spring 46 retards and cushions this return movement in its final phases. At another time in the rotation of the camming disk G0 lits camming lug 61 engages the lifting toe 63 and raises the lifting rod 41 in precisely the manner in which the lifting rod 40 has been raised.

It is to be understood that while one speed ratio has been shown as subsisting between the driving pulley 33 and the rotating cam disk 60 this ratio may be changed as desired and such change is contemplated in order to meet various demands. It is obvious also that the rate of oscillation ot the spindles may be varied by adjusting the oplll) Veratingmechanism or by'im'parting `higher or `lower rate of rotation to the driving pulley 38. Y

l claim: i

l. A valve grinding apparatus for use with valve assemblies including a vvalve cage and a valve loosely mounted in said cage,

. comprising a frame, `vertical spindles jour- .plo

naled in said frame, chucks carried at the lower ends of said spindlesand adapted to grip the valve stems, means for oscillating said spindles and means forperiodically dis-l engaging the cages from said valves. p

2.a valve grindingapparatus for use with valve assemblies including avalve cage and a valve loosely mounted in said cage,

comprising aframe, vertical spindles journaled in said frame, Ichucks carried at the lower ends of said spindles and adapted to gripythe valve stems, means for oscillating said spindles and means for periodically disengagingthe cages from said valves includ- Y ing vertically reciprocable rods `having forks engageable with said cages.

3. A valve grinding apparatus Vfor use with valve assemblies including a valve cage and a valve loosely mounted in said cage,

` comprising a frame, vertical spindles journaled in said frame, chucks carried at the` lower ends Vof said spindles and adaptedto grip the valvestemsJ means for oscillating said spindles, meansV for periodically disen-I gaging the cages from said valves including vertically reciprocable rods having forks engageable with said cages, and spring means for cushioning the return movement of said 4L. A valve grinding apparatus for use with valve assemblies including a valve cage and a valve loosely mounted in said cage, comprising a frame, vertical spindles journaled in said frame, chucks carried at the `lower ends of said spindles and adapted to grip the valve stems, means for oscillating said spindles including a driving pulley and motion transmission means between said pulley and said spindle, means forperiodically disengaging the cage from the valve including vertically reciprocable rods having bifurcated upper ends slidably mounted "in the frame, said bifurcated upper ends f each including a long arm and a short arm,

a lifting fork adjustably securedon the i lower end of each lifting rod and engageable with the adjacent valve cage, a lifting toe secured to the upper end of each of the long arms of said ,lift rods, a rotating cam disk having a camming lug engageable` with said lifting toes, gearing for driving said cam` of said lift rods.

5. A valve grinding apparatus for use Vwith valve assemblies including a valve cage and a valve loosely mounted in said cage, comprising a frame, vertical spindles'jourl naled in said frame, chucks.V carried at the lower ends of said spindles and adapted to grip the valve stems, means for oscillating said spindles including a driving pulley, motion transmission means between said pulley and said spindle, means forperiodically dis` engaging thecage from'the valve including vertical reciprocal rods having bifurcated `upper ends slidably mounted in the frame, said bifurcated upper ends each including a long arm and a short arm, a lifting fork adjustably secured on the lower end of each lifting rod and engageable with the adjacent valve cage, a lifting toe secured to the upper Y ming lug engageable with said lifting toes,

gearing for driving said cam disk from said driving pulley.

6. A valve grinding machine comprising a pair of standards, a frame adjustably mounted on said standards, a plurality of vertical spindles journaled in said frame, meansfor` oscillating said spindles including a crank arm'ixed to one yof said spindles, a rocking arm fixed to the other of said spindies, a link connecting said crank arm and said rock arm, a driving pulley having a crank pin and a connecting rod between the crank pin and the rock arm, chucks carried by the lower end of said spindles and adapted to grip the valve stems and hold the same suspended with the valve cages loosely engaged from the valves, and means forperiodically lifting the valve cages including lift rods mounted for `reciproca'tory movement on said frame, liftingforks carried by said forks and engageable with the valve cages, lifting toes carried by the upper ends of said lift rods, a rotatable cam disk journaled on said disk between said spindles and having a camming lug successively engagen able with said lifting toes and gearing for driving said disk from said driving pulley.

7. ik valve grinding apparatus including a plurality of vertical spindles, chucks carried by said spindles and adapted to engage the stems of the valves, means for oscillating said spindles, and means engageable with the cages for periodically disengaging the cages from thevalves.

FERNANDO JOHN DlERlFlELD.

toV 

